Gao, C.; Gao, W.; Pan, S.; Chen, W.; Shi, X., and Wang, D., 2015. High-precision oceanic real-time positioning application based on regional continuous operation reference stations.

With the rapid development of land-based Global Navigation Satellite System (GNSS) positioning technology, the high-precision oceanic GNSS positioning demands are more extensive. A real-time precise point positioning (PPP) method based on regional Continuous Operation Reference Stations (CORS) for ocean application is proposed in the paper. Starting fromthe requirement of real-time satellite orbit and clock products for the real-time PPP, the accuracy of IGU (International GNSS service Ultra-rapid) orbit product and its correlation with prediction time were analyzed. Also, a new easy and effective real-time estimation method of satellite clock based on regional CORS network was proposed, and the estimated clock was compared with the IGS final clock products. Then based on predicted IGU orbit and estimated real-time clock products, real-time PPP experiments in long-distance away areas were carried out to simulate ocean application. Experimental results show that the average RMS of estimated clock is less than 0.1ns compared with the IGS final clock. In the real-time PPP experiments, the average convergence time of the two selected long-distance areas are 16.5 minutes and 15.6 minutes respectively. The positioning errors in the three directions (North/East/Up) are within 6 cm after 1-hour filtering. The contents researched in the paper verify the feasibility of real-time PPP based on regional CORS for oceanic application and provide a new possible strategy for oceanic positioning application.